车间工具箱是提高工作效率的关键，通过合理的整理和分类，可以快速找到所需工具，减少时间浪费，将常用工具放在最易取的位置，如手电筒、螺丝刀等；按功能或用途分组存放，例如电工工具、木工工具等；定期检查和维护工具状态，确保其处于良好使用状态，这样不仅可以提升工作效率，还能保障工作安全。

The image shows a diagram with two triangles, (\triangle ABC) and (\triangle ADE), sharing the same vertex (A). The angles are labeled as follows:

• (\angle BAC = 30^\circ)
• (\angle BAD = 20^\circ)

We need to find the measure of (\angle EAD).

Step-by-step Solution:

1. Identify Given Angles:

   • (\angle BAC = 30^\circ)
   • (\angle BAD = 20^\circ)

2. Determine Relationship Between Angles: Since (\angle BAC) is part of both triangles, we can express it in terms of other known angles.

3. Calculate (\angle CAD): From the given information: [ \angle BAC = \angle BAD + \angle CAD ] Substituting the values: [ 30^\circ = 20^\circ + \angle CAD ] Solving for (\angle CAD): [ \angle CAD = 30^\circ - 20^\circ = 10^\circ ]

4. Find (\angle EAD): Notice that (\angle EAD) is complementary to (\angle CAD). Therefore: [ \angle EAD = \angle BAC - \angle CAD ] Substituting the value of (\angle CAD): [ \angle EAD = 30^\circ - 10^\circ = 20^\circ ]

Final Answer:

Therefore, the measure of (\angle EAD) is (20^\circ).